2021122211221 has 4 divisors (see below), whose sum is σ = 2022070651744. Its totient is φ = 2020173770700.

The previous prime is 2021122211201. The next prime is 2021122211239. The reversal of 2021122211221 is 1221122211202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2021122211221 - 2¹⁷ = 2021122080149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021122211201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 474217065 + ... + 474221326.

It is an arithmetic number, because the mean of its divisors is an integer number (505517662936).

Almost surely, 2^{2021122211221} is an apocalyptic number.

It is an amenable number.

2021122211221 is a deficient number, since it is larger than the sum of its proper divisors (948440523).

2021122211221 is an equidigital number, since it uses as much as digits as its factorization.

2021122211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 948440522.

The product of its (nonzero) digits is 128, while the sum is 19.

Subtracting from 2021122211221 its sum of digits (19), we obtain a palindrome (2021122211202).

Adding to 2021122211221 its reverse (1221122211202), we get a palindrome (3242244422423).

The spelling of 2021122211221 in words is "two trillion, twenty-one billion, one hundred twenty-two million, two hundred eleven thousand, two hundred twenty-one".